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If you have any kind of significant miss the "check engine" light show flash while the miss is active and remain lit after while storing a code for which cylinder/cylinders are the culprits .I would suspect a bad coil unit (one per cylinder) they run about $90 each on the 4.7l around here and are easy as pie to swap out (one wire connector and one M6-1.0 bolt 10MM wrench) I swapped the suspect coil pack with another cylinder and was able to "move the skip" so the diagnosis was very clear. I too would be leery of the mechanics honesty, these motors don't just puke out parts especially in the crank area, and to run fine after? Oh, and Occam's Razor , a very good concept to keep in mind and frequently correct, The simplest solution is usually correct. Scott
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